1bc36eafdSMike Gerdts /******************************************************************************
2bc36eafdSMike Gerdts *
3bc36eafdSMike Gerdts * Module Name: exmutex - ASL Mutex Acquire/Release functions
4bc36eafdSMike Gerdts *
5bc36eafdSMike Gerdts *****************************************************************************/
6bc36eafdSMike Gerdts
7*35786f68SRobert Mustacchi /******************************************************************************
8*35786f68SRobert Mustacchi *
9*35786f68SRobert Mustacchi * 1. Copyright Notice
10*35786f68SRobert Mustacchi *
11*35786f68SRobert Mustacchi * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12bc36eafdSMike Gerdts * All rights reserved.
13bc36eafdSMike Gerdts *
14*35786f68SRobert Mustacchi * 2. License
15*35786f68SRobert Mustacchi *
16*35786f68SRobert Mustacchi * 2.1. This is your license from Intel Corp. under its intellectual property
17*35786f68SRobert Mustacchi * rights. You may have additional license terms from the party that provided
18*35786f68SRobert Mustacchi * you this software, covering your right to use that party's intellectual
19*35786f68SRobert Mustacchi * property rights.
20*35786f68SRobert Mustacchi *
21*35786f68SRobert Mustacchi * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22*35786f68SRobert Mustacchi * copy of the source code appearing in this file ("Covered Code") an
23*35786f68SRobert Mustacchi * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24*35786f68SRobert Mustacchi * base code distributed originally by Intel ("Original Intel Code") to copy,
25*35786f68SRobert Mustacchi * make derivatives, distribute, use and display any portion of the Covered
26*35786f68SRobert Mustacchi * Code in any form, with the right to sublicense such rights; and
27*35786f68SRobert Mustacchi *
28*35786f68SRobert Mustacchi * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29*35786f68SRobert Mustacchi * license (with the right to sublicense), under only those claims of Intel
30*35786f68SRobert Mustacchi * patents that are infringed by the Original Intel Code, to make, use, sell,
31*35786f68SRobert Mustacchi * offer to sell, and import the Covered Code and derivative works thereof
32*35786f68SRobert Mustacchi * solely to the minimum extent necessary to exercise the above copyright
33*35786f68SRobert Mustacchi * license, and in no event shall the patent license extend to any additions
34*35786f68SRobert Mustacchi * to or modifications of the Original Intel Code. No other license or right
35*35786f68SRobert Mustacchi * is granted directly or by implication, estoppel or otherwise;
36*35786f68SRobert Mustacchi *
37*35786f68SRobert Mustacchi * The above copyright and patent license is granted only if the following
38*35786f68SRobert Mustacchi * conditions are met:
39*35786f68SRobert Mustacchi *
40*35786f68SRobert Mustacchi * 3. Conditions
41*35786f68SRobert Mustacchi *
42*35786f68SRobert Mustacchi * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43*35786f68SRobert Mustacchi * Redistribution of source code of any substantial portion of the Covered
44*35786f68SRobert Mustacchi * Code or modification with rights to further distribute source must include
45*35786f68SRobert Mustacchi * the above Copyright Notice, the above License, this list of Conditions,
46*35786f68SRobert Mustacchi * and the following Disclaimer and Export Compliance provision. In addition,
47*35786f68SRobert Mustacchi * Licensee must cause all Covered Code to which Licensee contributes to
48*35786f68SRobert Mustacchi * contain a file documenting the changes Licensee made to create that Covered
49*35786f68SRobert Mustacchi * Code and the date of any change. Licensee must include in that file the
50*35786f68SRobert Mustacchi * documentation of any changes made by any predecessor Licensee. Licensee
51*35786f68SRobert Mustacchi * must include a prominent statement that the modification is derived,
52*35786f68SRobert Mustacchi * directly or indirectly, from Original Intel Code.
53*35786f68SRobert Mustacchi *
54*35786f68SRobert Mustacchi * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55*35786f68SRobert Mustacchi * Redistribution of source code of any substantial portion of the Covered
56*35786f68SRobert Mustacchi * Code or modification without rights to further distribute source must
57*35786f68SRobert Mustacchi * include the following Disclaimer and Export Compliance provision in the
58*35786f68SRobert Mustacchi * documentation and/or other materials provided with distribution. In
59*35786f68SRobert Mustacchi * addition, Licensee may not authorize further sublicense of source of any
60*35786f68SRobert Mustacchi * portion of the Covered Code, and must include terms to the effect that the
61*35786f68SRobert Mustacchi * license from Licensee to its licensee is limited to the intellectual
62*35786f68SRobert Mustacchi * property embodied in the software Licensee provides to its licensee, and
63*35786f68SRobert Mustacchi * not to intellectual property embodied in modifications its licensee may
64*35786f68SRobert Mustacchi * make.
65*35786f68SRobert Mustacchi *
66*35786f68SRobert Mustacchi * 3.3. Redistribution of Executable. Redistribution in executable form of any
67*35786f68SRobert Mustacchi * substantial portion of the Covered Code or modification must reproduce the
68*35786f68SRobert Mustacchi * above Copyright Notice, and the following Disclaimer and Export Compliance
69*35786f68SRobert Mustacchi * provision in the documentation and/or other materials provided with the
70*35786f68SRobert Mustacchi * distribution.
71*35786f68SRobert Mustacchi *
72*35786f68SRobert Mustacchi * 3.4. Intel retains all right, title, and interest in and to the Original
73*35786f68SRobert Mustacchi * Intel Code.
74*35786f68SRobert Mustacchi *
75*35786f68SRobert Mustacchi * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76*35786f68SRobert Mustacchi * Intel shall be used in advertising or otherwise to promote the sale, use or
77*35786f68SRobert Mustacchi * other dealings in products derived from or relating to the Covered Code
78*35786f68SRobert Mustacchi * without prior written authorization from Intel.
79*35786f68SRobert Mustacchi *
80*35786f68SRobert Mustacchi * 4. Disclaimer and Export Compliance
81*35786f68SRobert Mustacchi *
82*35786f68SRobert Mustacchi * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83*35786f68SRobert Mustacchi * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84*35786f68SRobert Mustacchi * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85*35786f68SRobert Mustacchi * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86*35786f68SRobert Mustacchi * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87*35786f68SRobert Mustacchi * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88*35786f68SRobert Mustacchi * PARTICULAR PURPOSE.
89*35786f68SRobert Mustacchi *
90*35786f68SRobert Mustacchi * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91*35786f68SRobert Mustacchi * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92*35786f68SRobert Mustacchi * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93*35786f68SRobert Mustacchi * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94*35786f68SRobert Mustacchi * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95*35786f68SRobert Mustacchi * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96*35786f68SRobert Mustacchi * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97*35786f68SRobert Mustacchi * LIMITED REMEDY.
98*35786f68SRobert Mustacchi *
99*35786f68SRobert Mustacchi * 4.3. Licensee shall not export, either directly or indirectly, any of this
100*35786f68SRobert Mustacchi * software or system incorporating such software without first obtaining any
101*35786f68SRobert Mustacchi * required license or other approval from the U. S. Department of Commerce or
102*35786f68SRobert Mustacchi * any other agency or department of the United States Government. In the
103*35786f68SRobert Mustacchi * event Licensee exports any such software from the United States or
104*35786f68SRobert Mustacchi * re-exports any such software from a foreign destination, Licensee shall
105*35786f68SRobert Mustacchi * ensure that the distribution and export/re-export of the software is in
106*35786f68SRobert Mustacchi * compliance with all laws, regulations, orders, or other restrictions of the
107*35786f68SRobert Mustacchi * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108*35786f68SRobert Mustacchi * any of its subsidiaries will export/re-export any technical data, process,
109*35786f68SRobert Mustacchi * software, or service, directly or indirectly, to any country for which the
110*35786f68SRobert Mustacchi * United States government or any agency thereof requires an export license,
111*35786f68SRobert Mustacchi * other governmental approval, or letter of assurance, without first obtaining
112*35786f68SRobert Mustacchi * such license, approval or letter.
113*35786f68SRobert Mustacchi *
114*35786f68SRobert Mustacchi *****************************************************************************
115*35786f68SRobert Mustacchi *
116*35786f68SRobert Mustacchi * Alternatively, you may choose to be licensed under the terms of the
117*35786f68SRobert Mustacchi * following license:
118*35786f68SRobert Mustacchi *
119bc36eafdSMike Gerdts * Redistribution and use in source and binary forms, with or without
120bc36eafdSMike Gerdts * modification, are permitted provided that the following conditions
121bc36eafdSMike Gerdts * are met:
122bc36eafdSMike Gerdts * 1. Redistributions of source code must retain the above copyright
123bc36eafdSMike Gerdts * notice, this list of conditions, and the following disclaimer,
124bc36eafdSMike Gerdts * without modification.
125bc36eafdSMike Gerdts * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126bc36eafdSMike Gerdts * substantially similar to the "NO WARRANTY" disclaimer below
127bc36eafdSMike Gerdts * ("Disclaimer") and any redistribution must be conditioned upon
128bc36eafdSMike Gerdts * including a substantially similar Disclaimer requirement for further
129bc36eafdSMike Gerdts * binary redistribution.
130bc36eafdSMike Gerdts * 3. Neither the names of the above-listed copyright holders nor the names
131bc36eafdSMike Gerdts * of any contributors may be used to endorse or promote products derived
132bc36eafdSMike Gerdts * from this software without specific prior written permission.
133bc36eafdSMike Gerdts *
134*35786f68SRobert Mustacchi * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135*35786f68SRobert Mustacchi * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136*35786f68SRobert Mustacchi * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137*35786f68SRobert Mustacchi * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138*35786f68SRobert Mustacchi * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139*35786f68SRobert Mustacchi * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140*35786f68SRobert Mustacchi * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141*35786f68SRobert Mustacchi * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142*35786f68SRobert Mustacchi * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143*35786f68SRobert Mustacchi * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144*35786f68SRobert Mustacchi * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145*35786f68SRobert Mustacchi *
146*35786f68SRobert Mustacchi * Alternatively, you may choose to be licensed under the terms of the
147bc36eafdSMike Gerdts * GNU General Public License ("GPL") version 2 as published by the Free
148bc36eafdSMike Gerdts * Software Foundation.
149bc36eafdSMike Gerdts *
150*35786f68SRobert Mustacchi *****************************************************************************/
151bc36eafdSMike Gerdts
152bc36eafdSMike Gerdts #include "acpi.h"
153bc36eafdSMike Gerdts #include "accommon.h"
154bc36eafdSMike Gerdts #include "acinterp.h"
155bc36eafdSMike Gerdts #include "acevents.h"
156bc36eafdSMike Gerdts
157bc36eafdSMike Gerdts #define _COMPONENT ACPI_EXECUTER
158bc36eafdSMike Gerdts ACPI_MODULE_NAME ("exmutex")
159bc36eafdSMike Gerdts
160bc36eafdSMike Gerdts /* Local prototypes */
161bc36eafdSMike Gerdts
162bc36eafdSMike Gerdts static void
163bc36eafdSMike Gerdts AcpiExLinkMutex (
164bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *ObjDesc,
165bc36eafdSMike Gerdts ACPI_THREAD_STATE *Thread);
166bc36eafdSMike Gerdts
167bc36eafdSMike Gerdts
168bc36eafdSMike Gerdts /*******************************************************************************
169bc36eafdSMike Gerdts *
170bc36eafdSMike Gerdts * FUNCTION: AcpiExUnlinkMutex
171bc36eafdSMike Gerdts *
172bc36eafdSMike Gerdts * PARAMETERS: ObjDesc - The mutex to be unlinked
173bc36eafdSMike Gerdts *
174bc36eafdSMike Gerdts * RETURN: None
175bc36eafdSMike Gerdts *
176bc36eafdSMike Gerdts * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
177bc36eafdSMike Gerdts *
178bc36eafdSMike Gerdts ******************************************************************************/
179bc36eafdSMike Gerdts
180bc36eafdSMike Gerdts void
AcpiExUnlinkMutex(ACPI_OPERAND_OBJECT * ObjDesc)181bc36eafdSMike Gerdts AcpiExUnlinkMutex (
182bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *ObjDesc)
183bc36eafdSMike Gerdts {
184bc36eafdSMike Gerdts ACPI_THREAD_STATE *Thread = ObjDesc->Mutex.OwnerThread;
185bc36eafdSMike Gerdts
186bc36eafdSMike Gerdts
187bc36eafdSMike Gerdts if (!Thread)
188bc36eafdSMike Gerdts {
189bc36eafdSMike Gerdts return;
190bc36eafdSMike Gerdts }
191bc36eafdSMike Gerdts
192bc36eafdSMike Gerdts /* Doubly linked list */
193bc36eafdSMike Gerdts
194bc36eafdSMike Gerdts if (ObjDesc->Mutex.Next)
195bc36eafdSMike Gerdts {
196bc36eafdSMike Gerdts (ObjDesc->Mutex.Next)->Mutex.Prev = ObjDesc->Mutex.Prev;
197bc36eafdSMike Gerdts }
198bc36eafdSMike Gerdts
199bc36eafdSMike Gerdts if (ObjDesc->Mutex.Prev)
200bc36eafdSMike Gerdts {
201bc36eafdSMike Gerdts (ObjDesc->Mutex.Prev)->Mutex.Next = ObjDesc->Mutex.Next;
202bc36eafdSMike Gerdts
203bc36eafdSMike Gerdts /*
204bc36eafdSMike Gerdts * Migrate the previous sync level associated with this mutex to
205bc36eafdSMike Gerdts * the previous mutex on the list so that it may be preserved.
206bc36eafdSMike Gerdts * This handles the case where several mutexes have been acquired
207bc36eafdSMike Gerdts * at the same level, but are not released in opposite order.
208bc36eafdSMike Gerdts */
209bc36eafdSMike Gerdts (ObjDesc->Mutex.Prev)->Mutex.OriginalSyncLevel =
210bc36eafdSMike Gerdts ObjDesc->Mutex.OriginalSyncLevel;
211bc36eafdSMike Gerdts }
212bc36eafdSMike Gerdts else
213bc36eafdSMike Gerdts {
214bc36eafdSMike Gerdts Thread->AcquiredMutexList = ObjDesc->Mutex.Next;
215bc36eafdSMike Gerdts }
216bc36eafdSMike Gerdts }
217bc36eafdSMike Gerdts
218bc36eafdSMike Gerdts
219bc36eafdSMike Gerdts /*******************************************************************************
220bc36eafdSMike Gerdts *
221bc36eafdSMike Gerdts * FUNCTION: AcpiExLinkMutex
222bc36eafdSMike Gerdts *
223bc36eafdSMike Gerdts * PARAMETERS: ObjDesc - The mutex to be linked
224bc36eafdSMike Gerdts * Thread - Current executing thread object
225bc36eafdSMike Gerdts *
226bc36eafdSMike Gerdts * RETURN: None
227bc36eafdSMike Gerdts *
228bc36eafdSMike Gerdts * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
229bc36eafdSMike Gerdts *
230bc36eafdSMike Gerdts ******************************************************************************/
231bc36eafdSMike Gerdts
232bc36eafdSMike Gerdts static void
AcpiExLinkMutex(ACPI_OPERAND_OBJECT * ObjDesc,ACPI_THREAD_STATE * Thread)233bc36eafdSMike Gerdts AcpiExLinkMutex (
234bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *ObjDesc,
235bc36eafdSMike Gerdts ACPI_THREAD_STATE *Thread)
236bc36eafdSMike Gerdts {
237bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *ListHead;
238bc36eafdSMike Gerdts
239bc36eafdSMike Gerdts
240bc36eafdSMike Gerdts ListHead = Thread->AcquiredMutexList;
241bc36eafdSMike Gerdts
242bc36eafdSMike Gerdts /* This object will be the first object in the list */
243bc36eafdSMike Gerdts
244bc36eafdSMike Gerdts ObjDesc->Mutex.Prev = NULL;
245bc36eafdSMike Gerdts ObjDesc->Mutex.Next = ListHead;
246bc36eafdSMike Gerdts
247bc36eafdSMike Gerdts /* Update old first object to point back to this object */
248bc36eafdSMike Gerdts
249bc36eafdSMike Gerdts if (ListHead)
250bc36eafdSMike Gerdts {
251bc36eafdSMike Gerdts ListHead->Mutex.Prev = ObjDesc;
252bc36eafdSMike Gerdts }
253bc36eafdSMike Gerdts
254bc36eafdSMike Gerdts /* Update list head */
255bc36eafdSMike Gerdts
256bc36eafdSMike Gerdts Thread->AcquiredMutexList = ObjDesc;
257bc36eafdSMike Gerdts }
258bc36eafdSMike Gerdts
259bc36eafdSMike Gerdts
260bc36eafdSMike Gerdts /*******************************************************************************
261bc36eafdSMike Gerdts *
262bc36eafdSMike Gerdts * FUNCTION: AcpiExAcquireMutexObject
263bc36eafdSMike Gerdts *
264bc36eafdSMike Gerdts * PARAMETERS: Timeout - Timeout in milliseconds
265bc36eafdSMike Gerdts * ObjDesc - Mutex object
266bc36eafdSMike Gerdts * ThreadId - Current thread state
267bc36eafdSMike Gerdts *
268bc36eafdSMike Gerdts * RETURN: Status
269bc36eafdSMike Gerdts *
270bc36eafdSMike Gerdts * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common
271bc36eafdSMike Gerdts * path that supports multiple acquires by the same thread.
272bc36eafdSMike Gerdts *
273bc36eafdSMike Gerdts * MUTEX: Interpreter must be locked
274bc36eafdSMike Gerdts *
275bc36eafdSMike Gerdts * NOTE: This interface is called from three places:
276bc36eafdSMike Gerdts * 1) From AcpiExAcquireMutex, via an AML Acquire() operator
277bc36eafdSMike Gerdts * 2) From AcpiExAcquireGlobalLock when an AML Field access requires the
278bc36eafdSMike Gerdts * global lock
279bc36eafdSMike Gerdts * 3) From the external interface, AcpiAcquireGlobalLock
280bc36eafdSMike Gerdts *
281bc36eafdSMike Gerdts ******************************************************************************/
282bc36eafdSMike Gerdts
283bc36eafdSMike Gerdts ACPI_STATUS
AcpiExAcquireMutexObject(UINT16 Timeout,ACPI_OPERAND_OBJECT * ObjDesc,ACPI_THREAD_ID ThreadId)284bc36eafdSMike Gerdts AcpiExAcquireMutexObject (
285bc36eafdSMike Gerdts UINT16 Timeout,
286bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *ObjDesc,
287bc36eafdSMike Gerdts ACPI_THREAD_ID ThreadId)
288bc36eafdSMike Gerdts {
289bc36eafdSMike Gerdts ACPI_STATUS Status;
290bc36eafdSMike Gerdts
291bc36eafdSMike Gerdts
292bc36eafdSMike Gerdts ACPI_FUNCTION_TRACE_PTR (ExAcquireMutexObject, ObjDesc);
293bc36eafdSMike Gerdts
294bc36eafdSMike Gerdts
295bc36eafdSMike Gerdts if (!ObjDesc)
296bc36eafdSMike Gerdts {
297bc36eafdSMike Gerdts return_ACPI_STATUS (AE_BAD_PARAMETER);
298bc36eafdSMike Gerdts }
299bc36eafdSMike Gerdts
300bc36eafdSMike Gerdts /* Support for multiple acquires by the owning thread */
301bc36eafdSMike Gerdts
302bc36eafdSMike Gerdts if (ObjDesc->Mutex.ThreadId == ThreadId)
303bc36eafdSMike Gerdts {
304bc36eafdSMike Gerdts /*
305bc36eafdSMike Gerdts * The mutex is already owned by this thread, just increment the
306bc36eafdSMike Gerdts * acquisition depth
307bc36eafdSMike Gerdts */
308bc36eafdSMike Gerdts ObjDesc->Mutex.AcquisitionDepth++;
309bc36eafdSMike Gerdts return_ACPI_STATUS (AE_OK);
310bc36eafdSMike Gerdts }
311bc36eafdSMike Gerdts
312bc36eafdSMike Gerdts /* Acquire the mutex, wait if necessary. Special case for Global Lock */
313bc36eafdSMike Gerdts
314bc36eafdSMike Gerdts if (ObjDesc == AcpiGbl_GlobalLockMutex)
315bc36eafdSMike Gerdts {
316bc36eafdSMike Gerdts Status = AcpiEvAcquireGlobalLock (Timeout);
317bc36eafdSMike Gerdts }
318bc36eafdSMike Gerdts else
319bc36eafdSMike Gerdts {
320bc36eafdSMike Gerdts Status = AcpiExSystemWaitMutex (ObjDesc->Mutex.OsMutex, Timeout);
321bc36eafdSMike Gerdts }
322bc36eafdSMike Gerdts
323bc36eafdSMike Gerdts if (ACPI_FAILURE (Status))
324bc36eafdSMike Gerdts {
325bc36eafdSMike Gerdts /* Includes failure from a timeout on TimeDesc */
326bc36eafdSMike Gerdts
327bc36eafdSMike Gerdts return_ACPI_STATUS (Status);
328bc36eafdSMike Gerdts }
329bc36eafdSMike Gerdts
330bc36eafdSMike Gerdts /* Acquired the mutex: update mutex object */
331bc36eafdSMike Gerdts
332bc36eafdSMike Gerdts ObjDesc->Mutex.ThreadId = ThreadId;
333bc36eafdSMike Gerdts ObjDesc->Mutex.AcquisitionDepth = 1;
334bc36eafdSMike Gerdts ObjDesc->Mutex.OriginalSyncLevel = 0;
335bc36eafdSMike Gerdts ObjDesc->Mutex.OwnerThread = NULL; /* Used only for AML Acquire() */
336bc36eafdSMike Gerdts
337bc36eafdSMike Gerdts return_ACPI_STATUS (AE_OK);
338bc36eafdSMike Gerdts }
339bc36eafdSMike Gerdts
340bc36eafdSMike Gerdts
341bc36eafdSMike Gerdts /*******************************************************************************
342bc36eafdSMike Gerdts *
343bc36eafdSMike Gerdts * FUNCTION: AcpiExAcquireMutex
344bc36eafdSMike Gerdts *
345bc36eafdSMike Gerdts * PARAMETERS: TimeDesc - Timeout integer
346bc36eafdSMike Gerdts * ObjDesc - Mutex object
347bc36eafdSMike Gerdts * WalkState - Current method execution state
348bc36eafdSMike Gerdts *
349bc36eafdSMike Gerdts * RETURN: Status
350bc36eafdSMike Gerdts *
351bc36eafdSMike Gerdts * DESCRIPTION: Acquire an AML mutex
352bc36eafdSMike Gerdts *
353bc36eafdSMike Gerdts ******************************************************************************/
354bc36eafdSMike Gerdts
355bc36eafdSMike Gerdts ACPI_STATUS
AcpiExAcquireMutex(ACPI_OPERAND_OBJECT * TimeDesc,ACPI_OPERAND_OBJECT * ObjDesc,ACPI_WALK_STATE * WalkState)356bc36eafdSMike Gerdts AcpiExAcquireMutex (
357bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *TimeDesc,
358bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *ObjDesc,
359bc36eafdSMike Gerdts ACPI_WALK_STATE *WalkState)
360bc36eafdSMike Gerdts {
361bc36eafdSMike Gerdts ACPI_STATUS Status;
362bc36eafdSMike Gerdts
363bc36eafdSMike Gerdts
364bc36eafdSMike Gerdts ACPI_FUNCTION_TRACE_PTR (ExAcquireMutex, ObjDesc);
365bc36eafdSMike Gerdts
366bc36eafdSMike Gerdts
367bc36eafdSMike Gerdts if (!ObjDesc)
368bc36eafdSMike Gerdts {
369bc36eafdSMike Gerdts return_ACPI_STATUS (AE_BAD_PARAMETER);
370bc36eafdSMike Gerdts }
371bc36eafdSMike Gerdts
372bc36eafdSMike Gerdts /* Must have a valid thread state struct */
373bc36eafdSMike Gerdts
374bc36eafdSMike Gerdts if (!WalkState->Thread)
375bc36eafdSMike Gerdts {
376bc36eafdSMike Gerdts ACPI_ERROR ((AE_INFO,
377bc36eafdSMike Gerdts "Cannot acquire Mutex [%4.4s], null thread info",
378bc36eafdSMike Gerdts AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
379bc36eafdSMike Gerdts return_ACPI_STATUS (AE_AML_INTERNAL);
380bc36eafdSMike Gerdts }
381bc36eafdSMike Gerdts
382bc36eafdSMike Gerdts /*
383bc36eafdSMike Gerdts * Current sync level must be less than or equal to the sync level
384bc36eafdSMike Gerdts * of the mutex. This mechanism provides some deadlock prevention.
385bc36eafdSMike Gerdts */
386bc36eafdSMike Gerdts if (WalkState->Thread->CurrentSyncLevel > ObjDesc->Mutex.SyncLevel)
387bc36eafdSMike Gerdts {
388bc36eafdSMike Gerdts ACPI_ERROR ((AE_INFO,
389bc36eafdSMike Gerdts "Cannot acquire Mutex [%4.4s], "
390bc36eafdSMike Gerdts "current SyncLevel is too large (%u)",
391bc36eafdSMike Gerdts AcpiUtGetNodeName (ObjDesc->Mutex.Node),
392bc36eafdSMike Gerdts WalkState->Thread->CurrentSyncLevel));
393bc36eafdSMike Gerdts return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
394bc36eafdSMike Gerdts }
395bc36eafdSMike Gerdts
396bc36eafdSMike Gerdts ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
397bc36eafdSMike Gerdts "Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, "
398bc36eafdSMike Gerdts "Depth %u TID %p\n",
399bc36eafdSMike Gerdts ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
400bc36eafdSMike Gerdts ObjDesc->Mutex.AcquisitionDepth, WalkState->Thread));
401bc36eafdSMike Gerdts
402bc36eafdSMike Gerdts Status = AcpiExAcquireMutexObject ((UINT16) TimeDesc->Integer.Value,
403bc36eafdSMike Gerdts ObjDesc, WalkState->Thread->ThreadId);
404bc36eafdSMike Gerdts
405bc36eafdSMike Gerdts if (ACPI_SUCCESS (Status) && ObjDesc->Mutex.AcquisitionDepth == 1)
406bc36eafdSMike Gerdts {
407bc36eafdSMike Gerdts /* Save Thread object, original/current sync levels */
408bc36eafdSMike Gerdts
409bc36eafdSMike Gerdts ObjDesc->Mutex.OwnerThread = WalkState->Thread;
410bc36eafdSMike Gerdts ObjDesc->Mutex.OriginalSyncLevel =
411bc36eafdSMike Gerdts WalkState->Thread->CurrentSyncLevel;
412bc36eafdSMike Gerdts WalkState->Thread->CurrentSyncLevel =
413bc36eafdSMike Gerdts ObjDesc->Mutex.SyncLevel;
414bc36eafdSMike Gerdts
415bc36eafdSMike Gerdts /* Link the mutex to the current thread for force-unlock at method exit */
416bc36eafdSMike Gerdts
417bc36eafdSMike Gerdts AcpiExLinkMutex (ObjDesc, WalkState->Thread);
418bc36eafdSMike Gerdts }
419bc36eafdSMike Gerdts
420bc36eafdSMike Gerdts ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
421bc36eafdSMike Gerdts "Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n",
422bc36eafdSMike Gerdts ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
423bc36eafdSMike Gerdts ObjDesc->Mutex.AcquisitionDepth));
424bc36eafdSMike Gerdts
425bc36eafdSMike Gerdts return_ACPI_STATUS (Status);
426bc36eafdSMike Gerdts }
427bc36eafdSMike Gerdts
428bc36eafdSMike Gerdts
429bc36eafdSMike Gerdts /*******************************************************************************
430bc36eafdSMike Gerdts *
431bc36eafdSMike Gerdts * FUNCTION: AcpiExReleaseMutexObject
432bc36eafdSMike Gerdts *
433bc36eafdSMike Gerdts * PARAMETERS: ObjDesc - The object descriptor for this op
434bc36eafdSMike Gerdts *
435bc36eafdSMike Gerdts * RETURN: Status
436bc36eafdSMike Gerdts *
437bc36eafdSMike Gerdts * DESCRIPTION: Release a previously acquired Mutex, low level interface.
438bc36eafdSMike Gerdts * Provides a common path that supports multiple releases (after
439bc36eafdSMike Gerdts * previous multiple acquires) by the same thread.
440bc36eafdSMike Gerdts *
441bc36eafdSMike Gerdts * MUTEX: Interpreter must be locked
442bc36eafdSMike Gerdts *
443bc36eafdSMike Gerdts * NOTE: This interface is called from three places:
444bc36eafdSMike Gerdts * 1) From AcpiExReleaseMutex, via an AML Acquire() operator
445bc36eafdSMike Gerdts * 2) From AcpiExReleaseGlobalLock when an AML Field access requires the
446bc36eafdSMike Gerdts * global lock
447bc36eafdSMike Gerdts * 3) From the external interface, AcpiReleaseGlobalLock
448bc36eafdSMike Gerdts *
449bc36eafdSMike Gerdts ******************************************************************************/
450bc36eafdSMike Gerdts
451bc36eafdSMike Gerdts ACPI_STATUS
AcpiExReleaseMutexObject(ACPI_OPERAND_OBJECT * ObjDesc)452bc36eafdSMike Gerdts AcpiExReleaseMutexObject (
453bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *ObjDesc)
454bc36eafdSMike Gerdts {
455bc36eafdSMike Gerdts ACPI_STATUS Status = AE_OK;
456bc36eafdSMike Gerdts
457bc36eafdSMike Gerdts
458bc36eafdSMike Gerdts ACPI_FUNCTION_TRACE (ExReleaseMutexObject);
459bc36eafdSMike Gerdts
460bc36eafdSMike Gerdts
461bc36eafdSMike Gerdts if (ObjDesc->Mutex.AcquisitionDepth == 0)
462bc36eafdSMike Gerdts {
463bc36eafdSMike Gerdts return_ACPI_STATUS (AE_NOT_ACQUIRED);
464bc36eafdSMike Gerdts }
465bc36eafdSMike Gerdts
466bc36eafdSMike Gerdts /* Match multiple Acquires with multiple Releases */
467bc36eafdSMike Gerdts
468bc36eafdSMike Gerdts ObjDesc->Mutex.AcquisitionDepth--;
469bc36eafdSMike Gerdts if (ObjDesc->Mutex.AcquisitionDepth != 0)
470bc36eafdSMike Gerdts {
471bc36eafdSMike Gerdts /* Just decrement the depth and return */
472bc36eafdSMike Gerdts
473bc36eafdSMike Gerdts return_ACPI_STATUS (AE_OK);
474bc36eafdSMike Gerdts }
475bc36eafdSMike Gerdts
476bc36eafdSMike Gerdts if (ObjDesc->Mutex.OwnerThread)
477bc36eafdSMike Gerdts {
478bc36eafdSMike Gerdts /* Unlink the mutex from the owner's list */
479bc36eafdSMike Gerdts
480bc36eafdSMike Gerdts AcpiExUnlinkMutex (ObjDesc);
481bc36eafdSMike Gerdts ObjDesc->Mutex.OwnerThread = NULL;
482bc36eafdSMike Gerdts }
483bc36eafdSMike Gerdts
484bc36eafdSMike Gerdts /* Release the mutex, special case for Global Lock */
485bc36eafdSMike Gerdts
486bc36eafdSMike Gerdts if (ObjDesc == AcpiGbl_GlobalLockMutex)
487bc36eafdSMike Gerdts {
488bc36eafdSMike Gerdts Status = AcpiEvReleaseGlobalLock ();
489bc36eafdSMike Gerdts }
490bc36eafdSMike Gerdts else
491bc36eafdSMike Gerdts {
492bc36eafdSMike Gerdts AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex);
493bc36eafdSMike Gerdts }
494bc36eafdSMike Gerdts
495bc36eafdSMike Gerdts /* Clear mutex info */
496bc36eafdSMike Gerdts
497bc36eafdSMike Gerdts ObjDesc->Mutex.ThreadId = 0;
498bc36eafdSMike Gerdts return_ACPI_STATUS (Status);
499bc36eafdSMike Gerdts }
500bc36eafdSMike Gerdts
501bc36eafdSMike Gerdts
502bc36eafdSMike Gerdts /*******************************************************************************
503bc36eafdSMike Gerdts *
504bc36eafdSMike Gerdts * FUNCTION: AcpiExReleaseMutex
505bc36eafdSMike Gerdts *
506bc36eafdSMike Gerdts * PARAMETERS: ObjDesc - The object descriptor for this op
507bc36eafdSMike Gerdts * WalkState - Current method execution state
508bc36eafdSMike Gerdts *
509bc36eafdSMike Gerdts * RETURN: Status
510bc36eafdSMike Gerdts *
511bc36eafdSMike Gerdts * DESCRIPTION: Release a previously acquired Mutex.
512bc36eafdSMike Gerdts *
513bc36eafdSMike Gerdts ******************************************************************************/
514bc36eafdSMike Gerdts
515bc36eafdSMike Gerdts ACPI_STATUS
AcpiExReleaseMutex(ACPI_OPERAND_OBJECT * ObjDesc,ACPI_WALK_STATE * WalkState)516bc36eafdSMike Gerdts AcpiExReleaseMutex (
517bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *ObjDesc,
518bc36eafdSMike Gerdts ACPI_WALK_STATE *WalkState)
519bc36eafdSMike Gerdts {
520bc36eafdSMike Gerdts UINT8 PreviousSyncLevel;
521bc36eafdSMike Gerdts ACPI_THREAD_STATE *OwnerThread;
522bc36eafdSMike Gerdts ACPI_STATUS Status = AE_OK;
523bc36eafdSMike Gerdts
524bc36eafdSMike Gerdts
525bc36eafdSMike Gerdts ACPI_FUNCTION_TRACE (ExReleaseMutex);
526bc36eafdSMike Gerdts
527bc36eafdSMike Gerdts
528bc36eafdSMike Gerdts if (!ObjDesc)
529bc36eafdSMike Gerdts {
530bc36eafdSMike Gerdts return_ACPI_STATUS (AE_BAD_PARAMETER);
531bc36eafdSMike Gerdts }
532bc36eafdSMike Gerdts
533bc36eafdSMike Gerdts OwnerThread = ObjDesc->Mutex.OwnerThread;
534bc36eafdSMike Gerdts
535bc36eafdSMike Gerdts /* The mutex must have been previously acquired in order to release it */
536bc36eafdSMike Gerdts
537bc36eafdSMike Gerdts if (!OwnerThread)
538bc36eafdSMike Gerdts {
539bc36eafdSMike Gerdts ACPI_ERROR ((AE_INFO,
540bc36eafdSMike Gerdts "Cannot release Mutex [%4.4s], not acquired",
541bc36eafdSMike Gerdts AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
542bc36eafdSMike Gerdts return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED);
543bc36eafdSMike Gerdts }
544bc36eafdSMike Gerdts
545bc36eafdSMike Gerdts /* Must have a valid thread ID */
546bc36eafdSMike Gerdts
547bc36eafdSMike Gerdts if (!WalkState->Thread)
548bc36eafdSMike Gerdts {
549bc36eafdSMike Gerdts ACPI_ERROR ((AE_INFO,
550bc36eafdSMike Gerdts "Cannot release Mutex [%4.4s], null thread info",
551bc36eafdSMike Gerdts AcpiUtGetNodeName (ObjDesc->Mutex.Node)));
552bc36eafdSMike Gerdts return_ACPI_STATUS (AE_AML_INTERNAL);
553bc36eafdSMike Gerdts }
554bc36eafdSMike Gerdts
555bc36eafdSMike Gerdts /*
556bc36eafdSMike Gerdts * The Mutex is owned, but this thread must be the owner.
557bc36eafdSMike Gerdts * Special case for Global Lock, any thread can release
558bc36eafdSMike Gerdts */
559bc36eafdSMike Gerdts if ((OwnerThread->ThreadId != WalkState->Thread->ThreadId) &&
560bc36eafdSMike Gerdts (ObjDesc != AcpiGbl_GlobalLockMutex))
561bc36eafdSMike Gerdts {
562bc36eafdSMike Gerdts ACPI_ERROR ((AE_INFO,
563bc36eafdSMike Gerdts "Thread %u cannot release Mutex [%4.4s] acquired by thread %u",
564bc36eafdSMike Gerdts (UINT32) WalkState->Thread->ThreadId,
565bc36eafdSMike Gerdts AcpiUtGetNodeName (ObjDesc->Mutex.Node),
566bc36eafdSMike Gerdts (UINT32) OwnerThread->ThreadId));
567bc36eafdSMike Gerdts return_ACPI_STATUS (AE_AML_NOT_OWNER);
568bc36eafdSMike Gerdts }
569bc36eafdSMike Gerdts
570bc36eafdSMike Gerdts /*
571bc36eafdSMike Gerdts * The sync level of the mutex must be equal to the current sync level. In
572bc36eafdSMike Gerdts * other words, the current level means that at least one mutex at that
573bc36eafdSMike Gerdts * level is currently being held. Attempting to release a mutex of a
574bc36eafdSMike Gerdts * different level can only mean that the mutex ordering rule is being
575bc36eafdSMike Gerdts * violated. This behavior is clarified in ACPI 4.0 specification.
576bc36eafdSMike Gerdts */
577bc36eafdSMike Gerdts if (ObjDesc->Mutex.SyncLevel != OwnerThread->CurrentSyncLevel)
578bc36eafdSMike Gerdts {
579bc36eafdSMike Gerdts ACPI_ERROR ((AE_INFO,
580bc36eafdSMike Gerdts "Cannot release Mutex [%4.4s], SyncLevel mismatch: "
581bc36eafdSMike Gerdts "mutex %u current %u",
582bc36eafdSMike Gerdts AcpiUtGetNodeName (ObjDesc->Mutex.Node),
583bc36eafdSMike Gerdts ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel));
584bc36eafdSMike Gerdts return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
585bc36eafdSMike Gerdts }
586bc36eafdSMike Gerdts
587bc36eafdSMike Gerdts /*
588bc36eafdSMike Gerdts * Get the previous SyncLevel from the head of the acquired mutex list.
589bc36eafdSMike Gerdts * This handles the case where several mutexes at the same level have been
590bc36eafdSMike Gerdts * acquired, but are not released in reverse order.
591bc36eafdSMike Gerdts */
592bc36eafdSMike Gerdts PreviousSyncLevel =
593bc36eafdSMike Gerdts OwnerThread->AcquiredMutexList->Mutex.OriginalSyncLevel;
594bc36eafdSMike Gerdts
595bc36eafdSMike Gerdts ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
596bc36eafdSMike Gerdts "Releasing: Object SyncLevel %u, Thread SyncLevel %u, "
597bc36eafdSMike Gerdts "Prev SyncLevel %u, Depth %u TID %p\n",
598bc36eafdSMike Gerdts ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
599bc36eafdSMike Gerdts PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth,
600bc36eafdSMike Gerdts WalkState->Thread));
601bc36eafdSMike Gerdts
602bc36eafdSMike Gerdts Status = AcpiExReleaseMutexObject (ObjDesc);
603bc36eafdSMike Gerdts if (ACPI_FAILURE (Status))
604bc36eafdSMike Gerdts {
605bc36eafdSMike Gerdts return_ACPI_STATUS (Status);
606bc36eafdSMike Gerdts }
607bc36eafdSMike Gerdts
608bc36eafdSMike Gerdts if (ObjDesc->Mutex.AcquisitionDepth == 0)
609bc36eafdSMike Gerdts {
610bc36eafdSMike Gerdts /* Restore the previous SyncLevel */
611bc36eafdSMike Gerdts
612bc36eafdSMike Gerdts OwnerThread->CurrentSyncLevel = PreviousSyncLevel;
613bc36eafdSMike Gerdts }
614bc36eafdSMike Gerdts
615bc36eafdSMike Gerdts ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
616bc36eafdSMike Gerdts "Released: Object SyncLevel %u, Thread SyncLevel, %u, "
617bc36eafdSMike Gerdts "Prev SyncLevel %u, Depth %u\n",
618bc36eafdSMike Gerdts ObjDesc->Mutex.SyncLevel, WalkState->Thread->CurrentSyncLevel,
619bc36eafdSMike Gerdts PreviousSyncLevel, ObjDesc->Mutex.AcquisitionDepth));
620bc36eafdSMike Gerdts
621bc36eafdSMike Gerdts return_ACPI_STATUS (Status);
622bc36eafdSMike Gerdts }
623bc36eafdSMike Gerdts
624bc36eafdSMike Gerdts
625bc36eafdSMike Gerdts /*******************************************************************************
626bc36eafdSMike Gerdts *
627bc36eafdSMike Gerdts * FUNCTION: AcpiExReleaseAllMutexes
628bc36eafdSMike Gerdts *
629bc36eafdSMike Gerdts * PARAMETERS: Thread - Current executing thread object
630bc36eafdSMike Gerdts *
631bc36eafdSMike Gerdts * RETURN: Status
632bc36eafdSMike Gerdts *
633bc36eafdSMike Gerdts * DESCRIPTION: Release all mutexes held by this thread
634bc36eafdSMike Gerdts *
635bc36eafdSMike Gerdts * NOTE: This function is called as the thread is exiting the interpreter.
636bc36eafdSMike Gerdts * Mutexes are not released when an individual control method is exited, but
637bc36eafdSMike Gerdts * only when the parent thread actually exits the interpreter. This allows one
638bc36eafdSMike Gerdts * method to acquire a mutex, and a different method to release it, as long as
639bc36eafdSMike Gerdts * this is performed underneath a single parent control method.
640bc36eafdSMike Gerdts *
641bc36eafdSMike Gerdts ******************************************************************************/
642bc36eafdSMike Gerdts
643bc36eafdSMike Gerdts void
AcpiExReleaseAllMutexes(ACPI_THREAD_STATE * Thread)644bc36eafdSMike Gerdts AcpiExReleaseAllMutexes (
645bc36eafdSMike Gerdts ACPI_THREAD_STATE *Thread)
646bc36eafdSMike Gerdts {
647bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *Next = Thread->AcquiredMutexList;
648bc36eafdSMike Gerdts ACPI_OPERAND_OBJECT *ObjDesc;
649bc36eafdSMike Gerdts
650bc36eafdSMike Gerdts
651bc36eafdSMike Gerdts ACPI_FUNCTION_TRACE (ExReleaseAllMutexes);
652bc36eafdSMike Gerdts
653bc36eafdSMike Gerdts
654bc36eafdSMike Gerdts /* Traverse the list of owned mutexes, releasing each one */
655bc36eafdSMike Gerdts
656bc36eafdSMike Gerdts while (Next)
657bc36eafdSMike Gerdts {
658bc36eafdSMike Gerdts ObjDesc = Next;
659bc36eafdSMike Gerdts ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
660bc36eafdSMike Gerdts "Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n",
661bc36eafdSMike Gerdts ObjDesc->Mutex.Node->Name.Ascii, ObjDesc->Mutex.SyncLevel,
662bc36eafdSMike Gerdts ObjDesc->Mutex.AcquisitionDepth));
663bc36eafdSMike Gerdts
664bc36eafdSMike Gerdts /* Release the mutex, special case for Global Lock */
665bc36eafdSMike Gerdts
666bc36eafdSMike Gerdts if (ObjDesc == AcpiGbl_GlobalLockMutex)
667bc36eafdSMike Gerdts {
668bc36eafdSMike Gerdts /* Ignore errors */
669bc36eafdSMike Gerdts
670bc36eafdSMike Gerdts (void) AcpiEvReleaseGlobalLock ();
671bc36eafdSMike Gerdts }
672bc36eafdSMike Gerdts else
673bc36eafdSMike Gerdts {
674bc36eafdSMike Gerdts AcpiOsReleaseMutex (ObjDesc->Mutex.OsMutex);
675bc36eafdSMike Gerdts }
676bc36eafdSMike Gerdts
677bc36eafdSMike Gerdts /* Update Thread SyncLevel (Last mutex is the important one) */
678bc36eafdSMike Gerdts
679bc36eafdSMike Gerdts Thread->CurrentSyncLevel = ObjDesc->Mutex.OriginalSyncLevel;
680bc36eafdSMike Gerdts
681bc36eafdSMike Gerdts /* Mark mutex unowned */
682bc36eafdSMike Gerdts
683bc36eafdSMike Gerdts Next = ObjDesc->Mutex.Next;
684bc36eafdSMike Gerdts
685bc36eafdSMike Gerdts ObjDesc->Mutex.Prev = NULL;
686bc36eafdSMike Gerdts ObjDesc->Mutex.Next = NULL;
687bc36eafdSMike Gerdts ObjDesc->Mutex.AcquisitionDepth = 0;
688bc36eafdSMike Gerdts ObjDesc->Mutex.OwnerThread = NULL;
689bc36eafdSMike Gerdts ObjDesc->Mutex.ThreadId = 0;
690bc36eafdSMike Gerdts }
691bc36eafdSMike Gerdts
692bc36eafdSMike Gerdts return_VOID;
693bc36eafdSMike Gerdts }
694